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. @einen 'tatrsl getest @ffice ,ni 1?, Mien-EL, or noo-Heeren, N nw YORK.

Letters Patent No. 76,933, dated April 21, 1868; antedated April 14, 1868,

IMPROVEMENT IN PUMP-Heraus itt rlgehule maar tu in their rtttts patent mit meting pitt et tte sami.

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TO ALL WHOM IT MAY QONCERN Be it known that I, FJ?. MICHEL, of Rochester, in the county of Monroe, and State of New York, have invented a certain new andnseful Improvement in Pumps; and I dohheroby declare that thefollowing is a full and exact description thereof, reference being had to thc accompanying drawings, making part of this speciticationv v Figure 1 is a central vertical section of my improved pump. Figure 2, a perspective view of the piston,with a. portion broken away to show the interior arrangement. Figures 3 and 4, perspective views of the vulves. l Like letters of reference indicate corresponding parts in all the figures'. i This improvement belongs to that class of doublevacting pumps in which the water enters alternately at the top audbottom of the piston, and iseleveted through the hollow piston-rod. The invention consists in the construction and'arrangement of the piston, which is cast entirely hollow, with ribs on the sides, and a doubleshouldered hook on the removable hottom-plate, which ribs and hoolis serve to stop the valves that cover and uncover the ports. v l

V As represented in the drawings, A is the piston, which plays in the ozdinary cylinder having a side passage, and B is the hollow piston-rod, extending to the top of tho well'.A n l i V'hc piston is coirfposedol` two principal `,pai-ts, a rim, a, with solid head, b, and a removable plate, a, at the bottom, which is attached by bolts or equivalent. These parts are respectively provided with ports, d d, d d', A

4as shown. The yinside of the rim oi' thc piston is provided on one sidcwith a suitable numb'r of ribs, or lugs, ff, leaving an open space at the top and bottom. ',The removable bottom of the piston is also provided with a .hook,.7t, projecting upward from the centre, and provided with doubleshoulders, z'z', corresponding in position with the ends gg ofthe ribs. l Tho'valves consist simply of twothin, plain disks, C C', having holes, k'vlc, in thc centro, for thc passngeot the water. The valve C is introduced in place in the upper part Aolf-the piston by simply inserting it from the.

bottom over thc tops of lthe ribsf, which arc on one side only ofthe rim. The valve C is then hooked over tho hook h, and the plate c is attached in' place to thc rim a. lhus arranged, -it will bc seen that bot-h valves rest square upon the ends of thc ribs and the hook, 'and play between them and thc heads ofthe piston.

The great value ot' this invention consists in casting the piston -entirely hollow, and providing it only with.

the ribs and hookft, 'toretnin thevvalvcs. lhesc parts are simply cast on, nnd'requiro but very little fitting. ".lliizfribs, by being situated on only one side of the rim, allow an easy insertion ofthe upper valvc, and the hook allows an easy application of thc lower valve, and when the piston isclosed, the. valves are lretained in place perfectly. This ready inscrtinggnd removing ofthe valvosis of much importance.

v:By this construction, also, algreut advantage is attained in malringthe space between the two 'valves entirely -hlopenzgid unobstructed,rso that no mudor extraneous matter can collect to obstruct the parts.4 Much diliicuity is experienced in this respect in ordinary pistons, tbc space in which is'contracted and tortuous.

I am aware that a plain kdisk-valve has been used ina piston, covering and uncovering the ports. Such I do not claim. My invention consists only in tho special arrangement of the ribs and hook with the hollow pis'- ton, wherebyftlie valves are easily inserted and removed, and a free passage is attained for the water. Such a device, so far as I am aware, is entirely new. v

What I claim as my invention, and desire to secure by Letters Patent, s'- Th'e construction of the hollow piston lA, with the ribsff, and hook h, for the ready insertion and removal of the valves, the-'whole arrangednnd operating in thc lmanner and for the purpose specified'.

In witness whereof, I have hereunto signed my name in thcprcsencc of twosubscribing witnesses. i F. P; MICHEL Witnesses:

J. A. Davis, Qurnev' .VAN Voonms. 

